The stablecoin landscape is undergoing a tectonic shift, driven by Europe’s Markets in Crypto-Assets (MiCA) regulation and a broader institutional embrace of fully compliant digital dollars. New on-chain data from Visa reveals that Circle’s USDC accounted for approximately 70% of adjusted stablecoin transaction volume in the first half of 2026, while Tether’s USDT slid to around 25%. The figures, which filter out exchange transfers and bot activity, point to a historic reversal of the multi-year dominance USDT held in both supply and trading activity.
At the heart of this consolidation is MiCA, which classifies stablecoins into Electronic Money Tokens (EMTs) and Asset-Referenced Tokens (ARTs), mandating banking or electronic money licenses for operations within the European Economic Area (EEA). Circle secured an Electronic Money Institution (EMI) license, making USDC and EURC the default compliant options for centralized exchanges, DeFi platforms, and arbitrage firms. As a result, trading pairs were re-engineered to prioritize USDC, and liquidity began migrating away from unauthorized assets like USDT, creating regional price gaps and friction costs.
Visa’s analysis shows adjusted stablecoin volume reached a record $1.79 trillion in June 2026, up 63% from the previous month and 125% year-over-year. In the first six months alone, volume totaled $8.82 trillion, already surpassing full-year 2024. The surge reflects deepening integration of USDC into payment, settlement, and treasury operations by major institutions including BNY and Standard Chartered. The US GENIUS Act, which established a federal framework for payment stablecoins, has further spurred regulated participation.
While USDT remains the largest stablecoin by circulating supply and continues to dominate exchange trading globally, regulatory pressures—especially MiCA—are forcing a bifurcation. Financial institutions and exchanges increasingly route regulated flows through USDC, while USDT retains its foothold in less regulated markets. The trend signals that compliance is becoming the primary driver of stablecoin utility, with market dominance increasingly tied to legal certainty and institutional-grade infrastructure.
